A hypothetical ion of element `X` with mass number `40`, posses `2` units of positive charge and `23%` more neutrons than electrons. Symbol of the ion is :
A
`._(20)^(40)X^(+2)`
B
`._(19)^(40)X^(+2)`
C
`._(18)^(40)X^(+2)`
D
None of these
Text Solution
Verified by Experts
The correct Answer is:
B
A hydrothetical ion of ……… `._(z)^(40)X^(2+)` `n=e+(23)/(100)e` , & `n = 40 -z` or `n=40-(e+2)` or `n=40-(e+2)` `40-(e+2)=e+(23)/(100)e` `40 = (123 e)/(100)+e+2` `40-2 = (223 e)/(100)` `e=17` , `z=19` , or `n=21`
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